Sifter for pulverulent material.



R. G. NEUMAN N. SIPTEB FOB PULVEBULENT'MATBBIAL. APPLICATION FILED 1111:.25. 1905.

911,258. v Patnted Feb. 2, 1909.

min 666 66'.

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"UNITED STATES PATENT ()FFIOE. I

RICHARD GOTTHILF NEUMANN, OF WAND SBEK, NEAR HAMBURG, GERMANY, ASSIGNOR TO THE FIRM OF KAKAO-GOMPAGNIE THEODOR REICHARDT, GESELLSOHAFT MIT BES- CHRANKTER HAFTUNG, OF WANDSBEK, NEAR HAMBURG, GERMANY.

SIFTER PULVERULENT MATERIAL.

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed August 25, 1905. Serial No. 275,778.

To all whom it may concern:

Be it known that I, RICHARD GOTTHILF NEUMANN, asubject of the German Emperor, and resident of Wandsbek, near Hamburg, in the German Empire, have invented certain new and useful Improvements in Sifters for Pulverulent Material, of which the following is a specification. v The present invention relates to im rovements in sifters forpulverulent material and more particularly to dust catchers of the cyclone-t e and the like and has for its object to sift powdery or pulverulent material such as flour, cacao-powder and the'like and to sefitrate from the complete mass more or e matter according to desire.

The invention consists in arranging a turnable valve or flap on the inlet-opening and a hopper made of fabric pervious to air in the lower art of the 'sifter.

In t e drawing is shown a sifter made according to thisinvention. I

Figure 1 shows a vertical section of the sifter and Fig. 2 shows a horizontal section of IIGSS.

celver b, which at its lower end is connected to the outletipe c for the coarser ingredients of the slftin -material. 7,

At the mouth 0 the inlet-pipe (1 there is inside of. the sifting chamber a flap-valve 9 attached to pivot-pins i, the upper one of which (projects through the ceiling of the casing an is provided with a handle f to adjust the valve g, the position of which decides the size of o ening. The 'valve 9 may be so ositioncd t at only a very narrow slit is 1e t, it is adjusted by means of thehandle from outside according to the desired degree of fine- The valve is arran ed in such a mannor, that the stream of s1fting-material, en-

tcring tangentially into the upper part of the sifting chamber, is, after making one turn as is shown by arrows, deflected from the circleath in such manner that it describes the ine of an Archimedean s iral'and at the same time moves in the line 0' a screw towards the receiver 1), so that a counter acting disturbance of the newl entering current of air mixed with the pulverulent material and the current circulating in the chamber is effectively prevented. In this manner by the action of whirls, created thereby, the coarser ingredients separate from the finer lighter parts, which by aid of the cone h below the mouth of the central outlet-pipe c are the easier carried away by the streams of air, which are impelled to move towards the axis of the chamber and out through the pipe 0 to the collectin place.

The conica receiver 1) is made of a closely woven fabric, so that the coarser ingredients of the sifting material may slide down to the outlet pipe, without being prevented therefrom b the circulating or whirling currents char e with sifting material and without being orccd throughthe fabric while the air itself partly passes through this fabric, thus reducln the pressure and allowing the sifting materia to come to rest during the separation.

What I claim and desire to secure by Letters Patent is:

In a sifter for pulverulent material, an uper cylindrical casing havingla tangential inet, a flap valve controlling t e inlet and projecting into the casing when 0 on to control the quantity of admission, efiect by one face the incoming air toward the periphery and by the other face deflect the air that passes around the periphery toward the center, a central outlet lower than the inlet and a conical receiver of a fabric pervious to air to vent air from the receiver and decrease the carrying capacity of the air current, substantially as and for the purposes set forth.

RICHARD GOTTHILF NEUMANN. Witnesses:

Max LEMoKE, HARRY RAECKNER.

so I 

